import { EventDispatcher } from '../core/EventDispatcher.js';
import {
  FrontSide,
  FlatShading,
  NormalBlending,
  LessEqualDepth,
  AddEquation,
  OneMinusSrcAlphaFactor,
  SrcAlphaFactor,
  AlwaysStencilFunc,
  KeepStencilOp,
} from '../constants.js';
import * as MathUtils from '../math/MathUtils.js';

let materialId = 0;

class Material extends EventDispatcher {
  constructor() {
    super();

    Object.defineProperty(this, 'id', { value: materialId++ });

    this.uuid = MathUtils.generateUUID();

    this.name = '';
    this.type = 'Material';

    this.fog = true;

    this.blending = NormalBlending;
    this.side = FrontSide;
    this.vertexColors = false;

    this.opacity = 1;
    this.transparent = false;

    this.blendSrc = SrcAlphaFactor;
    this.blendDst = OneMinusSrcAlphaFactor;
    this.blendEquation = AddEquation;
    this.blendSrcAlpha = null;
    this.blendDstAlpha = null;
    this.blendEquationAlpha = null;

    this.depthFunc = LessEqualDepth;
    this.depthTest = true;
    this.depthWrite = true;

    this.stencilWriteMask = 0xff;
    this.stencilFunc = AlwaysStencilFunc;
    this.stencilRef = 0;
    this.stencilFuncMask = 0xff;
    this.stencilFail = KeepStencilOp;
    this.stencilZFail = KeepStencilOp;
    this.stencilZPass = KeepStencilOp;
    this.stencilWrite = false;

    this.clippingPlanes = null;
    this.clipIntersection = false;
    this.clipShadows = false;

    this.shadowSide = null;

    this.colorWrite = true;

    this.precision = null; // override the renderer's default precision for this material

    this.polygonOffset = false;
    this.polygonOffsetFactor = 0;
    this.polygonOffsetUnits = 0;

    this.dithering = false;

    this.alphaTest = 0;
    this.alphaToCoverage = false;
    this.premultipliedAlpha = false;

    this.visible = true;

    this.toneMapped = true;

    this.userData = {};

    this.version = 0;
  }

  onBuild(/* shaderobject, renderer */) {}

  onBeforeCompile(/* shaderobject, renderer */) {}

  customProgramCacheKey() {
    return this.onBeforeCompile.toString();
  }

  setValues(values) {
    if (values === undefined) return;

    for (const key in values) {
      const newValue = values[key];

      if (newValue === undefined) {
        console.warn(`THREE.Material: '${key}' parameter is undefined.`);
        continue;
      }

      // for backward compatability if shading is set in the constructor
      if (key === 'shading') {
        console.warn(`THREE.${this.type}: .shading has been removed. Use the boolean .flatShading instead.`);
        this.flatShading = newValue === FlatShading;
        continue;
      }

      const currentValue = this[key];

      if (currentValue === undefined) {
        console.warn(`THREE.${this.type}: '${key}' is not a property of this material.`);
        continue;
      }

      if (currentValue && currentValue.isColor) {
        currentValue.set(newValue);
      } else if (currentValue && currentValue.isVector3 && newValue && newValue.isVector3) {
        currentValue.copy(newValue);
      } else {
        this[key] = newValue;
      }
    }
  }

  toJSON(meta) {
    const isRoot = meta === undefined || typeof meta === 'string';

    if (isRoot) {
      meta = {
        textures: {},
        images: {},
      };
    }

    const data = {
      metadata: {
        version: 4.5,
        type: 'Material',
        generator: 'Material.toJSON',
      },
    };

    // standard Material serialization
    data.uuid = this.uuid;
    data.type = this.type;

    if (this.name !== '') data.name = this.name;

    if (this.color && this.color.isColor) data.color = this.color.getHex();

    if (this.roughness !== undefined) data.roughness = this.roughness;
    if (this.metalness !== undefined) data.metalness = this.metalness;

    if (this.sheen && this.sheen.isColor) data.sheen = this.sheen.getHex();
    if (this.emissive && this.emissive.isColor) data.emissive = this.emissive.getHex();
    if (this.emissiveIntensity && this.emissiveIntensity !== 1) data.emissiveIntensity = this.emissiveIntensity;

    if (this.specular && this.specular.isColor) data.specular = this.specular.getHex();
    if (this.shininess !== undefined) data.shininess = this.shininess;
    if (this.clearcoat !== undefined) data.clearcoat = this.clearcoat;
    if (this.clearcoatRoughness !== undefined) data.clearcoatRoughness = this.clearcoatRoughness;

    if (this.clearcoatMap && this.clearcoatMap.isTexture) {
      data.clearcoatMap = this.clearcoatMap.toJSON(meta).uuid;
    }

    if (this.clearcoatRoughnessMap && this.clearcoatRoughnessMap.isTexture) {
      data.clearcoatRoughnessMap = this.clearcoatRoughnessMap.toJSON(meta).uuid;
    }

    if (this.clearcoatNormalMap && this.clearcoatNormalMap.isTexture) {
      data.clearcoatNormalMap = this.clearcoatNormalMap.toJSON(meta).uuid;
      data.clearcoatNormalScale = this.clearcoatNormalScale.toArray();
    }

    if (this.map && this.map.isTexture) data.map = this.map.toJSON(meta).uuid;
    if (this.matcap && this.matcap.isTexture) data.matcap = this.matcap.toJSON(meta).uuid;
    if (this.alphaMap && this.alphaMap.isTexture) data.alphaMap = this.alphaMap.toJSON(meta).uuid;

    if (this.lightMap && this.lightMap.isTexture) {
      data.lightMap = this.lightMap.toJSON(meta).uuid;
      data.lightMapIntensity = this.lightMapIntensity;
    }

    if (this.aoMap && this.aoMap.isTexture) {
      data.aoMap = this.aoMap.toJSON(meta).uuid;
      data.aoMapIntensity = this.aoMapIntensity;
    }

    if (this.bumpMap && this.bumpMap.isTexture) {
      data.bumpMap = this.bumpMap.toJSON(meta).uuid;
      data.bumpScale = this.bumpScale;
    }

    if (this.normalMap && this.normalMap.isTexture) {
      data.normalMap = this.normalMap.toJSON(meta).uuid;
      data.normalMapType = this.normalMapType;
      data.normalScale = this.normalScale.toArray();
    }

    if (this.displacementMap && this.displacementMap.isTexture) {
      data.displacementMap = this.displacementMap.toJSON(meta).uuid;
      data.displacementScale = this.displacementScale;
      data.displacementBias = this.displacementBias;
    }

    if (this.roughnessMap && this.roughnessMap.isTexture) data.roughnessMap = this.roughnessMap.toJSON(meta).uuid;
    if (this.metalnessMap && this.metalnessMap.isTexture) data.metalnessMap = this.metalnessMap.toJSON(meta).uuid;

    if (this.emissiveMap && this.emissiveMap.isTexture) data.emissiveMap = this.emissiveMap.toJSON(meta).uuid;
    if (this.specularMap && this.specularMap.isTexture) data.specularMap = this.specularMap.toJSON(meta).uuid;

    if (this.envMap && this.envMap.isTexture) {
      data.envMap = this.envMap.toJSON(meta).uuid;

      if (this.combine !== undefined) data.combine = this.combine;
    }

    if (this.envMapIntensity !== undefined) data.envMapIntensity = this.envMapIntensity;
    if (this.reflectivity !== undefined) data.reflectivity = this.reflectivity;
    if (this.refractionRatio !== undefined) data.refractionRatio = this.refractionRatio;

    if (this.gradientMap && this.gradientMap.isTexture) {
      data.gradientMap = this.gradientMap.toJSON(meta).uuid;
    }

    if (this.size !== undefined) data.size = this.size;
    if (this.shadowSide !== null) data.shadowSide = this.shadowSide;
    if (this.sizeAttenuation !== undefined) data.sizeAttenuation = this.sizeAttenuation;

    if (this.blending !== NormalBlending) data.blending = this.blending;
    if (this.side !== FrontSide) data.side = this.side;
    if (this.vertexColors) data.vertexColors = true;

    if (this.opacity < 1) data.opacity = this.opacity;
    if (this.transparent === true) data.transparent = this.transparent;

    data.depthFunc = this.depthFunc;
    data.depthTest = this.depthTest;
    data.depthWrite = this.depthWrite;
    data.colorWrite = this.colorWrite;

    data.stencilWrite = this.stencilWrite;
    data.stencilWriteMask = this.stencilWriteMask;
    data.stencilFunc = this.stencilFunc;
    data.stencilRef = this.stencilRef;
    data.stencilFuncMask = this.stencilFuncMask;
    data.stencilFail = this.stencilFail;
    data.stencilZFail = this.stencilZFail;
    data.stencilZPass = this.stencilZPass;

    // rotation (SpriteMaterial)
    if (this.rotation && this.rotation !== 0) data.rotation = this.rotation;

    if (this.polygonOffset === true) data.polygonOffset = true;
    if (this.polygonOffsetFactor !== 0) data.polygonOffsetFactor = this.polygonOffsetFactor;
    if (this.polygonOffsetUnits !== 0) data.polygonOffsetUnits = this.polygonOffsetUnits;

    if (this.linewidth && this.linewidth !== 1) data.linewidth = this.linewidth;
    if (this.dashSize !== undefined) data.dashSize = this.dashSize;
    if (this.gapSize !== undefined) data.gapSize = this.gapSize;
    if (this.scale !== undefined) data.scale = this.scale;

    if (this.dithering === true) data.dithering = true;

    if (this.alphaTest > 0) data.alphaTest = this.alphaTest;
    if (this.alphaToCoverage === true) data.alphaToCoverage = this.alphaToCoverage;
    if (this.premultipliedAlpha === true) data.premultipliedAlpha = this.premultipliedAlpha;

    if (this.wireframe === true) data.wireframe = this.wireframe;
    if (this.wireframeLinewidth > 1) data.wireframeLinewidth = this.wireframeLinewidth;
    if (this.wireframeLinecap !== 'round') data.wireframeLinecap = this.wireframeLinecap;
    if (this.wireframeLinejoin !== 'round') data.wireframeLinejoin = this.wireframeLinejoin;

    if (this.morphTargets === true) data.morphTargets = true;
    if (this.morphNormals === true) data.morphNormals = true;

    if (this.flatShading === true) data.flatShading = this.flatShading;

    if (this.visible === false) data.visible = false;

    if (this.toneMapped === false) data.toneMapped = false;

    if (JSON.stringify(this.userData) !== '{}') data.userData = this.userData;

    // TODO: Copied from Object3D.toJSON

    function extractFromCache(cache) {
      const values = [];

      for (const key in cache) {
        const data = cache[key];
        delete data.metadata;
        values.push(data);
      }

      return values;
    }

    if (isRoot) {
      const textures = extractFromCache(meta.textures);
      const images = extractFromCache(meta.images);

      if (textures.length > 0) data.textures = textures;
      if (images.length > 0) data.images = images;
    }

    return data;
  }

  clone() {
    return new this.constructor().copy(this);
  }

  copy(source) {
    this.name = source.name;

    this.fog = source.fog;

    this.blending = source.blending;
    this.side = source.side;
    this.vertexColors = source.vertexColors;

    this.opacity = source.opacity;
    this.transparent = source.transparent;

    this.blendSrc = source.blendSrc;
    this.blendDst = source.blendDst;
    this.blendEquation = source.blendEquation;
    this.blendSrcAlpha = source.blendSrcAlpha;
    this.blendDstAlpha = source.blendDstAlpha;
    this.blendEquationAlpha = source.blendEquationAlpha;

    this.depthFunc = source.depthFunc;
    this.depthTest = source.depthTest;
    this.depthWrite = source.depthWrite;

    this.stencilWriteMask = source.stencilWriteMask;
    this.stencilFunc = source.stencilFunc;
    this.stencilRef = source.stencilRef;
    this.stencilFuncMask = source.stencilFuncMask;
    this.stencilFail = source.stencilFail;
    this.stencilZFail = source.stencilZFail;
    this.stencilZPass = source.stencilZPass;
    this.stencilWrite = source.stencilWrite;

    const srcPlanes = source.clippingPlanes;
    let dstPlanes = null;

    if (srcPlanes !== null) {
      const n = srcPlanes.length;
      dstPlanes = new Array(n);

      for (let i = 0; i !== n; ++i) {
        dstPlanes[i] = srcPlanes[i].clone();
      }
    }

    this.clippingPlanes = dstPlanes;
    this.clipIntersection = source.clipIntersection;
    this.clipShadows = source.clipShadows;

    this.shadowSide = source.shadowSide;

    this.colorWrite = source.colorWrite;

    this.precision = source.precision;

    this.polygonOffset = source.polygonOffset;
    this.polygonOffsetFactor = source.polygonOffsetFactor;
    this.polygonOffsetUnits = source.polygonOffsetUnits;

    this.dithering = source.dithering;

    this.alphaTest = source.alphaTest;
    this.alphaToCoverage = source.alphaToCoverage;
    this.premultipliedAlpha = source.premultipliedAlpha;

    this.visible = source.visible;

    this.toneMapped = source.toneMapped;

    this.userData = JSON.parse(JSON.stringify(source.userData));

    return this;
  }

  dispose() {
    this.dispatchEvent({ type: 'dispose' });
  }

  set needsUpdate(value) {
    if (value === true) this.version++;
  }
}

Material.prototype.isMaterial = true;

export { Material };
